Culdesac, ID has a population of 359 and is the 21,464th largest city in the United States. The population density is 1,612 per sq mi which is 8348% higher than the Idaho average and 1679% higher than the national average. The median age in Culdesac is 39 which is approximately 9% higher than the Idaho average of 36. In Culdesac, 52% of the population over 15 years of age are married, 94% speak English and 1% speak Spanish. 56% of Culdesac residents were born in Idaho, 42% were born out of state, 1% were born outside of the United States and 1% were foreign born.